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The accumulation of positrons in a two-dimensional layer of tin embedded in aluminum is examined by Doppler broadening spectroscopy (DBS). For this purpose samples are grown out of high purity materials consisting of a step-shaped layer (0.1–200nm) of tin on a substrate of aluminum and covered by an aluminum layer of constant thickness (200nm).The positron implantation profile is varied by different...
A remoderator for the high intensity positron source NEPOMUC was developed and installed at the beam facility. A beam of remoderated positrons could be produced with different energies and a diameter of less than 2mm was obtained. The efficiency of the remoderation setup was determined to be 5%. Due to the brilliance of the remoderated beam, the measurements at the coincidence Doppler broadening spectrometer...
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